Blue Screen After a very short while my picture flickers and then it turns completely blue. The sound remains fine and I can change channels...but can't see anything but a blue screen. When I change to a DVD it does the same thing...it's ok for a while then goes blue.

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Check the signal type. It may be set incorrectly.
Change the channel. You may be on a blank channel.
Check to see if the TV is tuned to channel 3 or 4 if you are watching a videotape.
Check the TV/VCR button on the VCR is in the correct mode by pressing the TV/VCR button on your VCR.

sounds like 2 different problems here.
first problem sounds tuner related.
second sounds convergence related.
third issue (cost effective to repair ?)
at this point i would replace the set.
i hope this helps